Copper lines are abundant and provide efficient service, all around the world. This fact alone gives DSL a clear advantage over cable modems. While copper phone lines are already prevalent in homes and businesses everywhere, coaxial cable is not (especially at business locations around the world).
Cable modem companies are quick to point out the speeds at which their products transmit data upstream or downstream. However, those speeds decrease significantly when multiple users in a neighborhood serviced by cable modems log on at the same time. Cable modem companies cannot guarantee their users a specific amount of bandwidth. Because DSL is an individual subscriber service, a specific amount of bandwidth is guaranteed.
DSL has many other significant advantages, including:
Security -Cable modems operate on a shared line. Therefore, security is a much greater issue for cable modem users. although encryption improves cable modem security, it also increases overhead. DSL is a dedicated, individual subscriber service, thus providing far better user security. ¡P
Speed -DSL enables full use of phone line's bandwidth. Conversely, cable modem users are able to use just a fraction of a cable modem's potential speed, and as more cable modem users go online, their throughput will be even lower.
Reliability -Cable networks are known for more frequent periods of downtime. As previously mentioned, DSL is very reliable because it operates over the same copper wiring used for phone lines.
Interactive -DSL offers interactive capability. Cable modems are generally usable only for broadcasting to the subscriber.
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